<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:template match="/"> 
   			<option>Todas</option>  			
	   		<xsl:for-each select="operaciones/operacion">
	   			<option>
	   				<xsl:value-of select="nombre_operacion" />
	   			</option>
	   		</xsl:for-each>
    </xsl:template>
</xsl:stylesheet>